Classify the following soils according to the USCS. 1. This material has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. The liquid limit (not dried) is 37% while it is 26% when oven dried. The plastic index (not dried) is 6.
2. A soil with some organic odor was observed to change color to dark brown when wet. Additional examination of the soil resulted in LL (not dried) = 32, LL (oven dried) = 21, and PI (not dried) = 10. The soil showed weak reaction with HCL.
3. A soil characterized by the following description: "78 % fine to coarse, hard, subrounded to subangular gravel; 16 % silty (estimated fines); moist, brown; no reaction with HCL; original field sample had 7 % hard, subrounded cobbles and 2 % hard, subrounded boulders with a maximum dimension of 18 in.
4. A sample of well-graded gravel with sand has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand, and 2% fines. The maximum size of the particles is 75 mm. The coefficient of curvature is 2.7, while the uniformity coefficient is 12.4.
5. This sand has 61% predominately-fine sand, 23% silty fines, and 16% fine subrounded gravel size. The maximum size is 20 mm. The liquid limit is 33% and the plastic limit is 27%.